Well, it's more parallel universe creatures that got spiraled through time and space.
Such as:
Pale Ones: Pale, winged, stronger kobolds, basically.
Vramin: Mutated dwarves from another world with horrifying tendrils, claws of steel, and multi-caste.
I plan for one caste, should this mod become real, to have the [CURIOUSBEAST_DRINKER] tag. This would be explained by this variety remembering the taste of alcohol and searching for more.
Draco Leo: Purple, winged, big, horned, fireball-breathing lions with red eyes. (Somewhat based on the Final Fantasy series's Behemoth.)
And also some creatures from DF stories (if all goes well):
So far, one example would be The Nothing from Nomekast. (Can't think of many more.. anything from DF stories, anyone?)
2 (very psychic) races:
Cosmi: Psychic elves living in cities. Not very nature-bound compared to standard elves.
Mani: Copper-skinned horned psychic humanoids. Only feature discernable on their "faces" would be their glowing eyes. (Somewhat based on the Mani-Mani Statue from EarthBound.)
2 secrets:
Psychic: Allows access to the psychic powers of the Cosmi.
Sentience Bringer: Allows you to make creatures sentient with an interaction. Why not?
Oh! And a new megabeast inspired by Master Hand from Super Smash Bros. (Because I am a Nintendo fan.):
Hand of Armok: Big ass floating hand made of steel. Able to "cast" dragonfire, freezing wind and a necrotic gas.
(Hope I can make this mod a reality. May need help though.)